Human Eyes Need the Right Hormones to See Autumn Colors

November 19, 2018

(Pew Research Trusts) – The methods that Johnston and his team used arose from their investigations into stem cells and the factors that influence what they become. The researchers began with human embryonic stem cells and supplied them with nutrients that mirrored those present at different stages of fetal development. It’s intensive work, Eldred told The Washington Post, with the growing yet miniscule clusters of cells needing weeks of regular feedings and cleanings. Gradually, each cluster organizes itself into a functional 3D structure known as an organoid. As in a baby’s developing retina, cone cells that specialize in detecting light start to form, with those needed to perceive blue appearing first.